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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf8a8180ad4fd187455a7eedf9bdb9e2f371abadf90ad06c5bb86b2a190617b' 
  AND token = 'TWeTwmxFNpca93ch3oSZxAtAdCFYj9fbauyEsneAVew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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