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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3fd9a623ea0669620ae4b9bbcd2c18dab424fc5c40ac7ce409f2ae73cb1a11' 
  AND token = 'S0+djKOnOMJgfcSFlv0KB952P8DzBNUyXzTVh3Rl/As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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