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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecabc5e12fd0506d9027b2a91e5ec32e5786cff246d18bb6e2751aa32aaf74a' 
  AND token = 'nh8pyUkSNkv556l4uG3XoA2HGVFzkZx3c2vvtAwCIVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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