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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f591a74f38ba8cd5fd44af0f7cebbb9c59c55489c03df588419830b4624c32' 
  AND token = 'ErM8XTdijvSiOPRGY5z1ZI+s5z7Qv02CRF0XTL5tex0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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