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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed429c857e454d3a37276bd44a3eec7c3d33a61e5dfa877be73d792d7ebe54d' 
  AND token = 'qf9CsEDfoEThL9rgo41VPHlvsbREVyxPJ0gZlKftraU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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