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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587e021247865aab4a38601e87d30e0eb9313e2b6d800bf19aea92dd258811e9' 
  AND token = 'dptB/G2QxHEAb3Zgv44cBNAQRlLSzYpimk5Vf/uCp+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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