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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95984c8ab4d78e5c128cd33f4c579c42b21dff6a8bd9f1720380230d7b70aad8' 
  AND token = '62MnPwg+ocdXZoe9419yZcCXl50ilfnwe/5ikXtgusg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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