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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1a0eefd69381f37cbdacb9edc289e5ff620a6dc9b333512cfe92cd9870ab55' 
  AND token = 'Zy0Gb903YlQgfMb23e4EhpwoQPe2yqk5u6Zl45ouG1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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