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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba9598693ee532206472e7fa1113a589c23f3b706148203352a8781f6592c59' 
  AND token = 'Tdg8WSa5EQH6d+ZY6oJ6O13pH6OJPlhPeEg24Q2b74w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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