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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151443569d4c9c0da28fbbd3ad1c1704c7dd8e235d2c28ae01927e5d33b2a995' 
  AND token = '/AeCj6o8BfhM7CH0aYDRA29iGelc4m3fFiAmXav8gQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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