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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11d6a1dd2b7c4a5610c1a8c8c14da7f36ec3f8f0d8054d7bb525820e46b8abd' 
  AND token = 'VSqQ8KTM7Bl3T4bT7a3culedKbQsRNKegIVeRWZx/Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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