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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b414c8718798bff01ae3ed4de2a19e1834d79a2b5f16c1cfae4bced641fdf073' 
  AND token = 'LE3k2X039hkqqEkWggURWLqqAL6eA1xm4hUAuLbW3XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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