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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24b01747b33be95feb0d80fa2f49896ce989bb41b96d4d377cde2fd1655ab9e' 
  AND token = 'MqAwmZd6uJ94EB+Pc/A4f8ExwJzLRG6n80Qh8NqjQrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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