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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3185f8ed0742683026677998cfc037a5103829ab884f95a3559ff3af292110e6' 
  AND token = '6i0LqNLs38GCPUyaGRQMyQYNgch59f7ZMP6ZH/1GOz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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