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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3726c1b8b2746677b063ae93ae06769b56afa3e29b7c5d616d22408b010c17e2' 
  AND token = 'brTKtyaSd/SzjgUT8Jw+qatMlxgbc8btO4FY+dpvepw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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