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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ce5b53432807d8f36fffb6d477f0d9dfca528045a7ec921e4ea62289df7087' 
  AND token = 'eHEHKchuxAk3zSvoPnjxHEdsNve2sPoVyK/UR1aQJ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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