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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f0b8ee8e5b037ebb64483371b4b397649faccb068524e612a9498763cc2042' 
  AND token = 'i8B6T0Ahq8tzxE2xiTzh65uI3u2t4flxX2cpofqWqRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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