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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3636cec53e4634a4555f20d17eee1d3e43b5c8eb8d23c74c515d6bc29b01db0' 
  AND token = 'Z7ZJF058XljrKabAF6M1zIJTlbRmEnh7ZBPOsX7G/bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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