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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a34001ff17c45f9d700b7b9f67941b19ad7fb57d93ef8b8a1df482e7c3f5372' 
  AND token = 'b5aU1robjmj9TLZBT8KOZ7ThTnWeySwWo3iQcwHIxF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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