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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8056a0977c55fed08bb31874a75a2c654a5f970d297996cf128c73f48a9137' 
  AND token = 'OyuFxrpgTidFn9gBERzIsdzTjTl4Q0aUfk/TyRAmzjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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