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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19756cb94720d7d9c17b0a54055d6dcd30ac0adbf52dc1392f6d245feef57f32' 
  AND token = 'TD6O0L7JNfbFE57I9jlSiuURy87jl4oJKJE2JExU73s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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