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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c856988ea2e1552a0db34c057e257863a773335bd6ad3d7e60fc068934eea342' 
  AND token = 'dFWlZAbnVKtDbh0eQ/+zyw9LFhfUlJg11Rawve1NTzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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