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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6ca0efc3aaeb6c603055ddc8e9384cea25c5d2e4e5d33710f7e757d2dc2ec1' 
  AND token = '8/R4tiHSJwFdOMxLH3YfnQRp3Y3pv+U8xVs51d0EmHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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