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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0955dd441cd5835d6189eb470ad7f04d6ccab20fe03573d82fd8e2eb81a863c' 
  AND token = 'aRLn3sacev9wrPoEXo6/S7IiDcEY2ci17Vg/mFXRUNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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