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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1699d78560d4fb3e0faab3d4fb03a6c8ab5fcaf0699c9338754cdc7e013eb064' 
  AND token = '5T9zpxINtfmAV6HLTt0aNPCsFn4Xbu561H6Pi+pRy+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}