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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b66a7b10e163ee7943347ca529312614c0ec399d041c5b822dcf1f9ba1f52b' 
  AND token = '+lzWBoWWFGTl1Dep9/WW7F6sefTFX+oN9zcogTo4GzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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