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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137307a4e3a4681ac246faecb71fe78e27700c09600d531161244ad011b7586e' 
  AND token = 'uy1Ka8jezRqtj6H/0dK3fjf3ScMOQA6uAzOY/0xrgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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