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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086ea51ea4679d8a2fd8ca2bae9f1638adc520a1d25b0a650b5506dd13efb6b0' 
  AND token = 'us6yBYVo9rim3zA6DeZAjvCpQuiHV+oe4N4VmPdY2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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