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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960982d708def82314cdd94c6623b7c99f5ff1feae329078ad7a48e11b65748c' 
  AND token = 'LctZiZ+AwQ5IQW3w3LGsZkdpgGc1mvTMD6b6FtzN/zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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