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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9200fec6de1dde1a3eb046e61b05776c4790d684ac4859019e2f347db779a7cf' 
  AND token = '1iaOhbJV5dI5EAkAwf1CjEPsX+CuOqsxYNYgCR5AGIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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