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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f372128b927682f20d6074ded620eaf52afee3c0d7dd23012ba6ffc39ed598d3' 
  AND token = 'A5dqgNDAAum0/D/l1AmU9+cqhtcc5rpvGJf6uLEJdkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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