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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2d6769077c0855b69266737823fa5e6ddd3c2e6d08713c4fefad4ee63c6022' 
  AND token = 'ErnF4p013c6MTbQw/t4bqV/yYzmEW0HAiubDgIGOP24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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