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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ac2df0295eee198be922d14d525bb5c30c5492a34dc18ed383c8cf3d5a0fe4' 
  AND token = 'A/8acD/2GtzFfJQfe2lCOuAH/TW8Wuz0aUUQPJpUcfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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