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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1707a094a0290d44d673a9d5321b25d0d76fa4ce147323630c0824b50f51e749' 
  AND token = 'XDMGT26zDcMvK5g9JlYdnCYSyLUAHw/mrxvd/1Ef7i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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