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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f0957ef1ec9dffa82bd5cfc53873bada7382248b09521f2fff3aff91ba8ca4' 
  AND token = '71XxDytinLdHkdqji1EryprYY2o4LAGkB2NWeOco7Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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