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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9159f0aeb0de5f8c16089c2ed2c98cc52ce491e9983d9515193d7ac84fe009' 
  AND token = 'j052zYNEZ93UDHOn3EZlqZlEYmMffShruyI5HK2vRsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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