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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19630c6906acf76050133505d8ed55370afe9f6036e223bc2b7950edcae6ef08' 
  AND token = '8AlwZEIE52EFbiMPChs+fkGQV6eeoifg+RWjPJQ1X9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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