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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114515ebb9399c2d010b11a23297c220d6843587585ebc7ec16ec51b78c39930' 
  AND token = 'UJ2TTUFNbdfdbAnC4PO0zFJqsbog3BIBj4H1sngDu2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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