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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d67a0038b482bd4d2c2a413a9807c6feca10406057a51924fd88fc18c8feea7' 
  AND token = 'nfM3eAOIVkFy5PcWN2CS6OjzTtz4WAJNZ/YzAGikenU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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