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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df04e49ef53e16be907c00da56502db7bbbde4cf3d71cd7e1c90deb58308e50' 
  AND token = 'Ozw6rqMNI6Yj98DYCrjBt/50NU6MOgqSwAsaX8wqopA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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