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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5599021d39e63d6c5916c3971b0cfc00e03d61a94f6323a758fd6da095170b03' 
  AND token = '8GywkM906iK3Eytlnv3Y4Mj1E4qrID+6ViIrfk+FTEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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