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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7262bcb2fde30997d5c71a190f501dc51b45744aaede6db8a0b67e4fac2fccd8' 
  AND token = 'ZD0aCONPsZtr9dAB4WfoZU7shq21VMVf2f/gifz4ffc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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