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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb737175f974c66223b7924250f0d361e75f6dabdb7b2a4fdc8656b628da208' 
  AND token = 'ZP0mC3RqPRTLHEwNVemYl1T7BsnHPXH7cdCS1AbenvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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