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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57295deab1ace6397044a352fbb95eb0dfaad9101f5643bb54fdfa14267b018b' 
  AND token = '2TIzDo1toEFNalkFpt3dfURZUR2pJjVfi4NcY1DlRPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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