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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6b461a1c3ab2a7d7c90900608fd8bc8f7b40bcc7752d66c3f803e4da66d1ce' 
  AND token = 'ufqfwCOCI0XR+jrrqThtiqHBDeLWxNE3iyISk5fAfZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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