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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e6792d82e0cae1cdb4f9cb7781072de49f7e28a3e9bc53e3357be079241ff9' 
  AND token = '7RQkY+dynqOj5rF2o4nUv8XsplljD0nx+lA8OiuR9o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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