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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d8c9ca69d54781d59f6e51305014ad419fe8a0bf387394cbfcb3a5a868ad8e' 
  AND token = 'LH3izHxCrBCkPLN2F4MHjkU4m4o4BaNxHVmxDwiwKT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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