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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0594babddfe6d870ea5d9995d62708559018f19f6e18c884413a02f6c62cdbf9' 
  AND token = '/dfxgTp3mDImLua0VQ28hKDbEmnBnJK54uC3e5S/xwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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