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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37b893081747d7592c95496175e4517214e7c5fcf76faa8d56710ebc411a047' 
  AND token = 'h3ff5faSacppArnIXKCjs71z+o52y0/LYPYuhH+j0Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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