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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5134c00f66d752aafb96d1ff39f3f625ddc2df8ef8defb732c1e34f3754f3436' 
  AND token = 'bCyMPV/1sccbPyuTpf4Jxa152W+S/FZv9MyWaKAbbWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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