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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b88462ebb6bbc6e6028f37f4efcf54a5b1e42eba89138f737e5481d2e46c877' 
  AND token = 'x9NLItHUd1MwUF9Wa0a9TxaUMLJfx7jIPoe5/RlW2D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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