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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e508fc117b2327c5d4a52e1e7b41a2359dc6975cacf72c596ce444ca9672d0fa' 
  AND token = '1rLOsg+7UaYafmPEL0P5KSHEOqINuijrUBE6fEkHWWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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