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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a00a61ec3995d4cde021e82862ef30e5950315dade4692b3657d3f7086a2ee' 
  AND token = '9dVJDRIMV5TyuzZYukUvCWWjgvsDtj07c+wSy7E3PCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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