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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ced3d7164527120adbfbe635293a9990e2d6267057222e9f0ec4b4da0b82f6d' 
  AND token = 'su/Byb0RCs88QGuebgx/3ZuR2pjYXcsvuVkz1VB34+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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