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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df74d7a0821ef51a673d2a458f1971797989c0ee6c0470bbbab86b1856c791a' 
  AND token = 'qXOpMA0w1zC9v1uqBWbncBeYj1jLDfR/O5spjxGCDy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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