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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c01c1ae87efd80a819d0f2110099126d3c951743dad0b20a5ece7cd12e0147c' 
  AND token = 'iFoDVnIxzeXJy47te2QalINHjMkjg5gYVM0m1KqUM3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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