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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0582d20a331271fc4e476519439f7515557f3843cb2e402aa07ac101cec0d2c7' 
  AND token = '9+rZAGgjiwDr/OvtvnWRbSGgR725Iin2ba/Vte8xOg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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