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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b52407033ea8ed8c0265dedc550d96f33c46d97a63b0618a606c609bc44cd6' 
  AND token = 'eZEk9haFe3dwA9KVE3CW9kkdR0M0r2w4t1w7dVXOJqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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