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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8465c5dc3e38af21107d00da75b81c5ea4176978d9afbd727a8e2a8a903f86' 
  AND token = 'ow8An5q7NTakIdqtfKJ3Dn8uSTcVQgKigpxkZyyleyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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