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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a36889f8ba69557ff1169a1359c53afe6faf5e802fc450087146d4a63f05e3' 
  AND token = 'PLfrCnJr2vAB9ulSKTAsa1b8OnXembUZ/bBCOVVHTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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