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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc0692dc680a22ef8b105f91ad116d38bfd94cf4391fbd02f57792c3442935d' 
  AND token = 'OBLXH3tKNEmUpOjFBiM/7d5+FVss7e0G2qtF4/ATkKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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