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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599151fbcbc3f91b7dfd200b14b0b34079db7756b46c66f3ea5babd43e974c24' 
  AND token = 'O7jNGRFXrbrBRtUq1jbjs7Fyoe5hIXwHXnU34d1ZLOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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