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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b94b897ee93e932a0b713bedab4e70fdea0132c41bbae638ff9cb3e23bc1fc2' 
  AND token = '7rcJJqZ01xQV2FFe7gHQtYG+KaG/Ocy8SaB0KAHUOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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